Malicious PDF — malware analysis report

Static analysis result for SHA-256 481ce1ba73c94d2b…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 08:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e12a270b2d37805dbc3a900de1f6b37b SHA-1: c1334c5c86639453b82fd57476f1d5173fe11bf5 SHA-256: 481ce1ba73c94d2b01d56a07540dc488f4f886750ce69cb5a6d0fba450191054
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=national+people%27s+coalition
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e8c305ef5---kabomujum.pdf
    • https://muahohangnhat.com/app/webroot/uploads/files/pusobirurijuxoral.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb437a25a30---volabavaxelazi.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607783314a0bb---nejobuvifirozitobijajer.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a8c77f622---serikabixobofubokip.pdf
    • http://tofuyatogo.com/uploads/files/dibux.pdf
    • http://adaviestransportltd.com/userfiles/file/nubeja.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a5db7a874---vupedaxut.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/6ab2be4780a6f0438bb340f16c98c9cb/gujedagugefenurasawogegiz.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3cd99bcdc0433b06708e020a390b40c0/lixafeda.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609402fb12544---27392710788.pdf
    • http://boothbayharborshipyard.com/userfiles/file/lijelesesakonetukodedozok.pdf
    • http://americanewbie.com/userfiles/file/52231182686.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f1e0f03e77b0282d5af9ff3e55fe11b9/19970320171.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/55bangl9srg1hp69rk2jirkje2/sekalujufi.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/c7c8ef2295f12707f772ecfc5bdc6284/10199375907.pdf
    • http://ggmtc.net/userfiles/files/rogalurepuvamomulez.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9c0b4aeb---5615684166.pdf
    • http://goldcoil.com/uploadfiles/files/dugumadaza.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cec52086e7---88524043581.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e21f5b2b3---jijaxedafedepop.pdf
    • http://sjar-tech.com/uploadfile/file///2021053118513717.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 16792 bytes
font_01_sfnt_off000105e7.bin
035f5216ec4305637f4db69a4c64e5e782ceb295d8cf072845c4dd19da8628fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 10280 bytes
font_02_sfnt_off00011d38.bin
88f4624e6cb4975aafcaee96f0cf3b98a9ad52b2e637d3d5ce848fb32482d15f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D38 17204 bytes